Sunbeams! But without blurring of the rest of the scene?
Light rays coming into dark (church window) always will look better, than open foggy environment for this sun-beams.



If you want to avoid volumetrics in back part of the scene, make volumetric Cube smaller or use some texture for Density node to keep Volume Scatter in specific part of your scene.


Separate XYZ node is used instead of Mapping node just because it is still difficult for me to use it for orientation simple Gradient texture in one of main axis.

You can also render separately Volume Pass, add some contrast and composite it.